class Solution:
    # 这里要特别注意~找到任意重复的一个值并赋值到duplication[0]
    # 函数返回True/False
    def duplicate(self, numbers, duplication):
        # write code here
        if len(numbers)==0:
            return False
        d=[]
        for i in range(len(numbers)):
            if numbers[i] not in d:
                d.append(numbers[i])
            else:
                duplication[0] = numbers[i]
                return True
        return False